Understanding Digestive Ripening of Ligand-Stabilized, Charged Metal Nanoparticles

Research output: Contribution to journalArticle

Researchers

Research units

  • University of Valencia
  • École Polytechnique Fédérale de Lausanne (EPFL)
  • EPFL Valais Wallis

Abstract

Most syntheses of thiolate-protected metal nanoparticles (NPs) include a thermochemical step in which the as-prepared, polydisperse NPs are transformed to a narrower size distribution in a poorly understood process known as digestive ripening (DR). Previous theoretical approaches considered either surface and electrostatic contributions or surface and ligand-binding contributions. We show that the three contributions are needed to obtain theoretical predictions in agreement with experimental observations. Although statistical thermodynamics does not clarify mechanistic details, it certainly provides valuable insights on the DR process. Remarkably, a relatively simple theory with no fitting parameters satisfactorily explains the roles of the metal:ligand ratio, the NP charge, the relative permittivity of the solvent, the ripening temperature, the binding energy, and the ligand chain length.

Details

Original languageEnglish
Pages (from-to)13405-13411
Number of pages7
JournalJournal of Physical Chemistry C
Volume121
Issue number24
Publication statusPublished - 22 Jun 2017
MoE publication typeA1 Journal article-refereed

ID: 31513193